装置冷循环过程中,要注意控制好()的液面平衡。
A.初馏塔、常压塔、汽提塔
B.初馏塔、常压塔、减压塔
C.常压塔、减压塔、汽提塔
D.初馏塔、减压塔、汽提塔
参考答案:B
Without facts , a person can’t form a correct opinion , for he needs to have actual knowledge _____ his thinking .
A.which to be based on
B.on which to base
C.which to be based
D.which to base
肿瘤标志物不包括()
A.前列腺酸性磷酸酶
B.前列腺特异性抗原
C.神经元烯醇化酶
D.α岩藻糖苷酶
E.脂肪酶